as long as the spring isn't left compressed it will be fine(pulled back ready to shoot), shooting the gun on full auto than storing it will do this, pop a couple rounds on semi and it should be fine, if you fire the gun and after you hear the popo of the spring slamming forward and you hear the whir of the gears turning right after the spring is now compressed again, try and have it so when you pull the trigger on semi the pop is the last noise it makes and the spring will be good.